Hello all! I'm studying for my final, and I'm trying to figure out my teacher's method for the following problem. Could you help me out? A plane wave is propagating in free space with a frequency of 10 GHz. The amplitude of the electric field in the x-direction is Ex = 2 V m-1. (ii) Find the magnitude of electric and magnetic field if the plane wave is transmitted through a medium with relative permittivity . She then goes on to say that you simply need to find the impedance of the material and set H=E/impedance. I realize that this is a true ratio, but shouldn't we have to calculate to magnitude of E in the medium? She uses the value of E in free space, which I think is wrong. Her answers: E=2 V/m H=11.86 mA/m Thanks in advance!